參數(shù)資料
型號: μPD78P0308Y
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8 Bit Single Chip Microcontrollers
中文描述: 8位單片機(jī)微控制器
文件頁數(shù): 24/70頁
文件大?。?/td> 552K
代理商: ΜPD78P0308Y
μ
PD78P0308Y
24
Preliminary Data Sheet
IXRAM3
IXRAM2
IXRAM1
IXRAM0
Internal Expansion RAM
Capacity Selection
1
0
1
0
1024 bytes
Other than above
Setting prohibited
Symbol
7
6
5
4
3
2
1
0
Address
After Reset
R/W
IXS
0
0
0
0
IXRAM3
IXRAM2
IXRAM1
IXRAM0
FFF4H
0AH
W
4.
INTERNAL EXPANSION RAM SIZE SWITCHING REGISTER (IXS)
This register is used to set the internal expansion RAM capacity by software. By setting this internal expansion
RAM size switching register (IXS), it is possible to get the same memory map as that of the mask ROM versions with
a different internal expansion RAM capacity.
IXS is set with an 8-bit memory manipulation instruction.
RESET input sets IXS to 0AH.
Figure 4-1. Internal Expansion RAM Size Switching Register Format
Table 4-1 shows the setting values of IXS that make the memory mapping the same as that of the mask ROM
versions.
Table 4-1. Internal Expansion RAM Size Switching Register Setting Values
Target Mask ROM Versions
IXS Setting Value
μ
PD780306Y
0AH
μ
PD780308Y
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